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參數(shù)資料
| 型號： | LT3686IDD#TRPBF |
| 廠商： | LINEAR TECHNOLOGY CORP |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | 2.65 A SWITCHING REGULATOR, 2500 kHz SWITCHING FREQ-MAX, PDSO10 |
| 封裝： | 3 X 3 MM, LEAD FREE, PLASTIC, MO-229WEED-2, DFN-10 |
| 文件頁數(shù)： | 6/28頁 |
| 文件大?。?/td> | 509K |
| 代理商： | LT3686IDD#TRPBF |
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LT3686
14
3686fc
a high quality (underdamped) tank circuit. If the LT3686
circuit is plugged into a live supply, the input voltage can
ring to twice its nominal value, possibly exceeding the
LT3686’s voltage rating. This situation is easily avoided;
see the Hot-Plugging Safely section.
Output Capacitor
The output capacitor has two essential functions. Along
with the inductor, it filters the square wave generated by
the LT3686 to produce the DC output. In this role it deter-
mines the output ripple so low impedance at the switching
frequency is important. The second function is to store
energy in order to satisfy transient loads and stabilize the
LT3686’s control loop. Ceramic capacitors have very low
equivalent series resistance (ESR) and provide the best
ripple performance. A good value is:
COUT =
145
VOUT f
where COUTisinμFandfrequencyisinMHz.UseanX5Ror
X7R type and keep in mind that a ceramic capacitor biased
with VOUT will have less than its nominal capacitance. This
choice will provide low output ripple and good transient
response. Transient performance can be improved with
a high value capacitor, but a phase lead capacitor across
the feedback resistor, R1, may be required to get the full
benefit (see the Compensation section).
For small size, the output capacitor can be chosen ac-
cording to:
COUT =
83
VOUT f
where COUT is in μF and frequency is in MHz. However,
usinganoutputcapacitorthissmallresultsinanincreased
loop crossover frequency and increased sensitivity to
noise, requiring careful PCB design.
High performance electrolytic capacitors can be used for
the output capacitor. Low ESR is important, so choose one
that is intended for use in switching regulators. The ESR
should be specified by the supplier and should be 0.1Ω
or less. Such a capacitor will be larger than a ceramic
capacitor and will have a larger capacitance, because the
capacitor must be large to achieve low ESR. Table 3 lists
several capacitor vendors.
ApplicAtions inForMAtion
Table 3
VENDOR
PHONE
URL
PART SERIES
COMMENTS
Panasonic
(714) 373-7366
www.panasonic.com
Ceramic
Polymer
Tantalum
EEF Series
Kemet
(864) 963-6300
www.kemet.com
Ceramic
Tantalum
T494, T495
Sanyo
(408) 794-9714
www.sanyovideo.com
Ceramic
Polymer
Tantalum
POSCAP
Murata
(404) 436-1300
www.murata.com
Ceramic
AVX
www.avxcorp.com
Ceramic
Tantalum
TPS Series
Taiyo Yuden
(864) 963-6300
www.taiyo-yuden.com
Ceramic
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